move the size callback into apprt

src/Window.zig

@@ -139,7 +139,7 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
     errdefer alloc.destroy(self);
 
     // Create the windowing system
-    var winsys = try apprt.runtime.Window.init(app);
+    var winsys = try apprt.runtime.Window.init(app, self);
     errdefer winsys.deinit();
 
     // Initialize our renderer with our initialized windowing system.
@@ -394,8 +394,6 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
     // }, .{ .width = null, .height = null });
 
     // Setup our callbacks and user data
-    winsys.window.setUserPointer(self);
-    winsys.window.setSizeCallback(sizeCallback);
     winsys.window.setCharCallback(charCallback);
     winsys.window.setKeyCallback(keyCallback);
     winsys.window.setFocusCallback(focusCallback);
@@ -409,11 +407,7 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
     // init stuff we should get rid of this. But this is required because
     // sizeCallback does retina-aware stuff we don't do here and don't want
     // to duplicate.
-    sizeCallback(
+    try self.sizeCallback(window_size);
-        winsys.window,
-        @intCast(i32, window_size.width),
-        @intCast(i32, window_size.height),
-    );
 
     // Load imgui. This must be done LAST because it has to be done after
     // all our GLFW setup is complete.
@@ -682,67 +676,48 @@ fn cursorPosToPixels(self: Window, pos: glfw.Window.CursorPos) glfw.Window.Curso
     };
 }
 
-fn sizeCallback(window: glfw.Window, width: i32, height: i32) void {
+pub fn sizeCallback(self: *Window, size: apprt.WindowSize) !void {
     const tracy = trace(@src());
     defer tracy.end();
 
-    // glfw gives us signed integers, but negative width/height is n
-    // non-sensical so we use unsigned throughout, so assert.
-    assert(width >= 0);
-    assert(height >= 0);
-
-    // Get our framebuffer size since this will give us the size in pixels
-    // whereas width/height in this callback is in screen coordinates. For
-    // Retina displays (or any other displays that have a scale factor),
-    // these will not match.
-    const px_size = window.getFramebufferSize() catch |err| err: {
-        log.err("error querying window size in pixels, will use screen size err={}", .{err});
-        break :err glfw.Window.Size{
-            .width = @intCast(u32, width),
-            .height = @intCast(u32, height),
-        };
-    };
-
-    const win = window.getUserPointer(Window) orelse return;
-
     // TODO: if our screen size didn't change, then we should avoid the
     // overhead of inter-thread communication
 
     // Save our screen size
-    win.screen_size = .{
+    self.screen_size = .{
-        .width = px_size.width,
+        .width = size.width,
-        .height = px_size.height,
+        .height = size.height,
     };
 
     // Recalculate our grid size
-    win.grid_size = renderer.GridSize.init(
+    self.grid_size = renderer.GridSize.init(
-        win.screen_size.subPadding(win.padding),
+        self.screen_size.subPadding(self.padding),
-        win.cell_size,
+        self.cell_size,
     );
-    if (win.grid_size.columns < 5 and (win.padding.left > 0 or win.padding.right > 0)) {
+    if (self.grid_size.columns < 5 and (self.padding.left > 0 or self.padding.right > 0)) {
         log.warn("WARNING: very small terminal grid detected with padding " ++
             "set. Is your padding reasonable?", .{});
     }
-    if (win.grid_size.rows < 2 and (win.padding.top > 0 or win.padding.bottom > 0)) {
+    if (self.grid_size.rows < 2 and (self.padding.top > 0 or self.padding.bottom > 0)) {
         log.warn("WARNING: very small terminal grid detected with padding " ++
             "set. Is your padding reasonable?", .{});
     }
 
     // Mail the renderer
-    _ = win.renderer_thread.mailbox.push(.{
+    _ = self.renderer_thread.mailbox.push(.{
-        .screen_size = win.screen_size,
+        .screen_size = self.screen_size,
     }, .{ .forever = {} });
-    win.queueRender() catch unreachable;
+    try self.queueRender();
 
     // Mail the IO thread
-    _ = win.io_thread.mailbox.push(.{
+    _ = self.io_thread.mailbox.push(.{
         .resize = .{
-            .grid_size = win.grid_size,
+            .grid_size = self.grid_size,
-            .screen_size = win.screen_size,
+            .screen_size = self.screen_size,
-            .padding = win.padding,
+            .padding = self.padding,
         },
     }, .{ .forever = {} });
-    win.io_thread.wakeup.send() catch {};
+    try self.io_thread.wakeup.send();
 }
 
 fn charCallback(window: glfw.Window, codepoint: u21) void {

src/apprt/glfw.zig

@@ -14,6 +14,7 @@ const internal_os = @import("../os/main.zig");
 const renderer = @import("../renderer.zig");
 const Renderer = renderer.Renderer;
 const apprt = @import("../apprt.zig");
+const CoreWindow = @import("../Window.zig");
 
 // Get native API access on certain platforms so we can do more customization.
 const glfwNative = glfw.Native(.{
@@ -29,7 +30,7 @@ pub const Window = struct {
     /// The glfw mouse cursor handle.
     cursor: glfw.Cursor,
 
-    pub fn init(app: *const App) !Window {
+    pub fn init(app: *const App, core_win: *CoreWindow) !Window {
         // Create our window
         const win = try glfw.Window.create(
             640,
@@ -81,6 +82,10 @@ pub const Window = struct {
             try win.setCursor(cursor);
         }
 
+        // Set our callbacks
+        win.setUserPointer(core_win);
+        win.setSizeCallback(sizeCallback);
+
         // Build our result
         return Window{
             .window = win,
@@ -141,9 +146,35 @@ pub const Window = struct {
         return apprt.ContentScale{ .x = scale.x_scale, .y = scale.y_scale };
     }
 
-    /// Returns the size of the window in screen coordinates.
+    /// Returns the size of the window in pixels. The pixel size may
+    /// not match screen coordinate size but we should be able to convert
+    /// back and forth using getContentScale.
     pub fn getSize(self: *const Window) !apprt.WindowSize {
-        const size = try self.window.getSize();
+        const size = self.window.getFramebufferSize() catch |err| err: {
+            log.err("error querying window size in pixels, will use screen size err={}", .{err});
+            break :err try self.window.getSize();
+        };
+
         return apprt.WindowSize{ .width = size.width, .height = size.height };
     }
+
+    fn sizeCallback(window: glfw.Window, width: i32, height: i32) void {
+        _ = width;
+        _ = height;
+
+        // Get the size. We are given a width/height but this is in screen
+        // coordinates and we want raw pixels. The core window uses the content
+        // scale to scale appropriately.
+        const core_win = window.getUserPointer(CoreWindow) orelse return;
+        const size = core_win.windowing_system.getSize() catch |err| {
+            log.err("error querying window size for size callback err={}", .{err});
+            return;
+        };
+
+        // Call the primary callback.
+        core_win.sizeCallback(size) catch |err| {
+            log.err("error in size callback err={}", .{err});
+            return;
+        };
+    }
 };

src/apprt/structs.zig

@@ -6,7 +6,7 @@ pub const ContentScale = struct {
     y: f32,
 };
 
-/// The size of the window in screen coordinates.
+/// The size of the window in pixels.
 pub const WindowSize = struct {
     width: u32,
     height: u32,